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2012-10-18
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421,567 views
2012-10-11
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2012-10-10
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2012-07-23
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2012-05-21
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2012-05-07
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2,300,924 views
2012-05-04
Just How Small is an Atom?
7,613,832 views
2012-04-16
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427,033 views
2012-04-10
Questions No One Knows the Answers to (Full Version)
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2012-03-17